package com.hmall.trade.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.api.client.IcartClient;
import com.hmall.api.client.ItemClient;
import com.hmall.api.client.PayClient;
import com.hmall.api.dto.ItemDTO;
import com.hmall.api.dto.OrderDetailDTO;
import com.hmall.api.dto.StockRestoreDTO;
import com.hmall.common.exception.BadRequestException;
import com.hmall.common.utils.RabbitMqHelper;
import com.hmall.common.utils.UserContext;
import com.hmall.trade.constants.MQConstants;
import com.hmall.trade.domain.dto.OrderFormDTO;
import com.hmall.trade.domain.po.Order;
import com.hmall.trade.domain.po.OrderDetail;
import com.hmall.trade.mapper.OrderDetailMapper;
import com.hmall.trade.mapper.OrderMapper;
import com.hmall.trade.service.IOrderDetailService;
import com.hmall.trade.service.IOrderService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2023-05-05
 */
@Service
@RequiredArgsConstructor
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements IOrderService {

    private final ItemClient itemClient;
    private final IOrderDetailService detailService;
    private final IcartClient icatClient;
    private final PayClient payClient;
    private final IOrderDetailService orderDetailService;
    private final RabbitTemplate rabbitTemplate;
    private final OrderDetailMapper orderDetailMapper;
    private final  RabbitMqHelper rabbitMqHelper;

    @Override
    @GlobalTransactional
    public Long createOrder(OrderFormDTO orderFormDTO) {
        // 1.订单数据
        Order order = new Order();
        // 1.1.查询商品
        List<OrderDetailDTO> detailDTOS = orderFormDTO.getDetails();
        // 1.2.获取商品id和数量的Map
        Map<Long, Integer> itemNumMap = detailDTOS.stream()
                .collect(Collectors.toMap(OrderDetailDTO::getItemId, OrderDetailDTO::getNum));
        Set<Long> itemIds = itemNumMap.keySet();
        // 1.3.查询商品
        List<ItemDTO> items = itemClient.queryItemByIds(itemIds);
        if (items == null || items.size() < itemIds.size()) {
            throw new BadRequestException("商品不存在");
        }
        // 1.4.基于商品价格、购买数量计算商品总价：totalFee
        int total = 0;
        for (ItemDTO item : items) {
            total += item.getPrice() * itemNumMap.get(item.getId());
        }
        order.setTotalFee(total);
        // 1.5.其它属性
        order.setPaymentType(orderFormDTO.getPaymentType());
        order.setUserId(UserContext.getUser());
        order.setStatus(1);
        // 1.6.将Order写入数据库order表中
        save(order);

        // 2.保存订单详情
        List<OrderDetail> details = buildDetails(order.getId(), items, itemNumMap);
        detailService.saveBatch(details);

        // 3.清理购物车商品
//        icatClient.deleteCartItemByIds(itemIds);
        try {
            rabbitTemplate.convertAndSend("trade.topic", "order.create", itemIds);
        } catch (Exception e) {
            log.error("发送购物车ids失败！");
        }

        // 4.扣减库存
        try {
            itemClient.deductStock(detailDTOS);
        } catch (Exception e) {
            throw new RuntimeException("库存不足！");
        }

        //发送延迟消息，检测订单支付状态
//        rabbitTemplate.convertAndSend(
//                MQConstants.delayExhangeName,
//                MQConstants.delayOrderKEY,
//                order.getId(), new MessagePostProcessor() {
//                    @Override
//                    public Message postProcessMessage(Message message) throws AmqpException {
//                        message.getMessageProperties().setDelay(20000);//设置延迟时间为20秒
//                        return message;
//                    }
//                });


        rabbitMqHelper.sendDelayMessage(MQConstants.delayExhangeName, MQConstants.delayOrderKEY, order.getId(), 20000);

        return order.getId();
    }

    @Override
    public void markOrderPaySuccess(Long orderId) {
        Order order = new Order();
        order.setId(orderId);
        order.setStatus(2);
        order.setPayTime(LocalDateTime.now());
        updateById(order);
    }

    @GlobalTransactional
    @Override
    public void cancelOrder(Long orderId) {
        //- 将订单状态修改为已关闭
        Order order = new Order();
        order.setId(orderId);
        order.setStatus(5);
        updateById(order);
        try {
            payClient.updatePayOrderStatus(orderId, 2);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        //- 恢复订单中已经扣除的库存,库存在item表中
        //1.从order_detail表中根据订单id批量查询商品id和购买数量
        List<OrderDetail> orderDetails = orderDetailMapper.selectitemsum(orderId);
        if (orderDetails == null){
            log.error("订单不存在！");
            return;
        }
        // 将 OrderDetail 转换为 StockRestoreDTO 列表
        List<StockRestoreDTO> restoreList = orderDetails.stream()
                .map(detail -> new StockRestoreDTO(detail.getItemId(), detail.getNum()))
                .collect(Collectors.toList());
        //批量插入List<StockRestoreDTO>
        try {
            itemClient.restoreStock(restoreList);
        } catch (Exception e) {
           log.error("库存恢复失败！");
        }

    }

    private List<OrderDetail> buildDetails(Long orderId, List<ItemDTO> items, Map<Long, Integer> numMap) {
        List<OrderDetail> details = new ArrayList<>(items.size());
        for (ItemDTO item : items) {
            OrderDetail detail = new OrderDetail();
            detail.setName(item.getName());
            detail.setSpec(item.getSpec());
            detail.setPrice(item.getPrice());
            detail.setNum(numMap.get(item.getId()));
            detail.setItemId(item.getId());
            detail.setImage(item.getImage());
            detail.setOrderId(orderId);
            details.add(detail);
        }
        return details;
    }
}
